In recent years, high-power LEDs have developed rapidly, with large improvements in structure and performance, increased output, and reduced prices. A single-power ultra-high-power white LED with a power of 100W has also been developed. Compared with previous years, there has been considerable progress in luminous efficiency. For example, Edison's 20W white LEDs in the past few years have a luminous flux of 700 lm and a luminous efficiency of 35 lm/W. The 100W white LED developed in 2007 has a luminous flux of 6000 lm and a luminous efficiency of 60 lm/W. For example, Lumiled's recently developed K2 white LEDs are compared with their I and III series products. It can be seen from the table that the K2 white LED has a large improvement in luminous flux, maximum junction temperature, thermal resistance and external dimensions. Cree's new XLamp XR to E cool white LEDs have a maximum brightness QS of 107 to 114 lm at 350 mA. These high-performance LEDs with good performance have created conditions for the development of LED white lighting fixtures. In the past few years, various white LED lighting fixtures were mainly made of low-power Φ5 white LEDs. For example, a bulb of 1 to 5 W, a tube lamp of 15 to 20 W, a street lamp of 40 to 60 W, a projection lamp, and the like. These lamps use tens to hundreds of Φ5 white LEDs, which have complicated production processes, poor reliability, high failure rate, large case size, and insufficient brightness. In order to improve the above shortcomings, in recent years, high-power white LEDs have been gradually used to replace the Φ5 white LEDs to design new lamps. For example, a street light made of 18 2W white LEDs would require hundreds of Φ5 white LEDs. In addition, with a 1.25W K2 series white LED, it can be made into a strong light flashlight with a luminous flux of 65lm, and the illumination distance can reach several tens of meters. It is impossible to use Φ5 white LEDs. Figure 1 Relationship between junction temperature TJ and relative light output rate Lamps made with high-power LEDs are much more expensive than incandescent, fluorescent, and energy-saving lamps, but their energy-saving effects and longevity are much higher than other lamps. If LED lighting is used in public places such as street lighting systems and waiting halls, large department stores or supermarkets, high-end hotel lobby, etc., the one-time investment is higher, but the long-term power saving effect and economy are worth looking forward to. of. At present, 1~3W high-power white LED is mainly used as the illumination lamp because of its high luminous efficiency, low price and flexible application. Our comprehensive line of magnetic buzzers and Piezo buzzers are used across many major industries as a means for audible identification or alert. From extremely compact 4 mm SMT buzzers to larger, high decibel models, this product family of audio indicators, audio transducers, piezo elements, and sirens is well suited to address the requirements of the most challenging applications. Backed by a suite of online tools, accessibility to stock, and a range of customization capabilities, you can trust your unique audio alert needs with us. Door Buzzer,Buzzer Alarm,Electric Buzzer,Buzzer Button NINGBO SANCO ELECTRONICS CO., LTD. , https://www.sancobuzzer.com